Question

The lower esophageal sphincter surrounds the upper opening into the stomach. If this sphincter failed to properly constrict, there might be a problem with _____.
A) regurgitation of acidic stomach contents into the esophagus, commonly called "heartburn"
B) the movement of swallowed food into the trachea rather than into the esophagus
C) too rapid emptying from the stomach into the small intestine
D) too rapid emptying of the small intestine into the large intestine
E) the control of defecation